Abstract
We explore the cosmological dynamics of a minimalistic yet generic string-inspired model for multifield dark energy. Adopting a supergravity four-dimensional viewpoint, we motivate the model’s structure arising from superstring compactifications involving a chiral superfield and a pure U(1) gauge sector. The chiral sector gives rise to a pair of scalar fields, such as the axio-dilaton, which are kinetically coupled. However, the scalar potential depends on only one of them, further entwined with the vector field through the gauge kinetic function. The model has two anisotropic attractor solutions that, despite a steep potential and thanks to multifield dynamics, could explain the current accelerated expansion of the Universe while satisfying observational constraints on the late-times cosmological anisotropy. Nevertheless, justifying the parameter space allowing for slow roll dynamics together with the correct cosmological parameters, would be challenging within the landscape of string theory. Intriguingly, we find that the vector field, particularly at one of the studied fixed points, plays a crucial role in enabling geodesic trajectories in the scalar field space while realizing slow-roll dynamics with a steep potential. This observation opens a new avenue for exploring multifield dark energy models within the superstring landscape.
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Acknowledgments
DG would like to thank Michele Cicoli and Francisco Pedro for our helpful email exchanges. Also to express his gratitude to the Physics Department of Universidad del Valle for their hospitality during the completion of this work. We are grateful to Michele Cicoli for their invaluable feedback on the near-final version of this manuscript. BOQ and CAVT are supported by Patrimonio Autónomo - Fondo Nacional de Financiamiento para la Ciencia, la Tecnología y la Innovación Francisco José de Caldas (MIN- CIENCIAS - COLOMBIA) Grant No. 110685269447 RC-80740-465-2020, project 69723 and by Vicerrectoría de Investigaciones - Universidad del Valle Grant No. 71357.
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Gallego, D., Orjuela-Quintana, J.B. & Valenzuela-Toledo, C.A. Anisotropic dark energy from string compactifications. J. High Energ. Phys. 2024, 131 (2024). https://doi.org/10.1007/JHEP04(2024)131
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DOI: https://doi.org/10.1007/JHEP04(2024)131